donice
error = donice(curp, uap->prio);
error = donice(p, uap->prio);
error = donice(p, uap->prio);
error = donice(p, info->prio);
static int donice (struct proc *chgp, int n);
errs += donice(which, who, prio, incr);
static int donice(int, int, int, int);